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13/01/04 Enabled AD7705 clock again as going to need both clocks running. Not sure
whether dodgy proposed scheme is going to work or be of any benefit.
14/01/04 Old software runs on hardware whereas new stuff doesn't! Something to
go on at last.
15/01/04 Found bug - I'd miss out a switch back to bank 0 when removing the old ADCON1
changeover code. Now can start making progress again.
All runs as before, seems fine! Audio works, temperature works, uart works.
Tried out CAL command, doesn't work. No real suprise. Need to test on
simulator.
22/02/04 Decided to implement calibration on PC. Not only is this quicker to sort
but also frees up more program space on PIC (onboard routines no longer
required). Removed and recompiled. Need to do PC app but should be
fairly simple in floating point basic!
29/02/04 Modified so starts writing current barograph entry immediately when
start a timer. Also now prevent writing if no more room left; and
terminate when reach the end.
Finally, change minimum baro rate to every second (possible as writes
all synchronised to adc tick and take less than a second) and rebuild.
Now just need to test out the barograph!
02/03/04 Made one small fix to barograph but not writing terminator all
the time. Also doesn't seem to like writing to barograph 2.
4/03/04 Fix terminate barograph, had pointer and end of buffer compare the
wrong way around.
13/04/04 Physically move centre key in caseworks so can press with gloved hand.
15/04/04 Modified timer auto start/stop so has to beep for three seconds
continually before starts/resets the timer.
Reduce time when quiet from 2 minutes to 30 seconds for timer to stop.
Quiet is now no beeps for three consecutive seconds.
18/04/04 Fixed bug where would watchdog when searching for the end of a long
trace in SEND command. Had clrwdt in wrong place.
Recalibrated altimeter now a low pressure system has moved through.
Implemented new loud piezo circuit.
Fixed bug so now clears pwm output pin to zero when stop pwm-ing.
Otherwise left in high state by bit ups on portc while pwm operational.
Dropped pitch of vario by 200Hz, made continuous when going down
and extended beep on period when going up.
19/04/04 Updated schematics, PCB, and website
22/04/04 Fixed so marks end of barograph if runs out of memory.
Changed barograph so stores QFE and not QNH, more useful.
25/04/04 Separated out timer start/stop vario thresholds and sounder beeps so
can configure latter. Modified so only beeps if < 2 down; still beep
up if > 0.6up. Timer thresholds are 1 down and 0.6up.
26/04/04 Changed tones from vario so dropped even more for going up. Made possible
as going down beeps are now simplified and as far down as they can go.
Display average vario as large vario and most recent reading in small
print; too rapid changes confusing to look at when flying and meaningless
as air isn't really doing that necessarily. Use the force instead!
Beep using averaged vario instead of instantaneous reading.
Add partial update readings into average; average time now previous
four seconds. Doesn't matter losing our 1 bit of accuracy as will
average out and close enough!
27/04/04 Modified down beeps so now even lower; do this by changing prescaler
to 1:16 when going down.
Ensure only write to t2con if need to otherwise cleares prescale counter.
Also, only reload period if changed as this may also affect things if
continually beeping and being 'reloaded'.
29/04/04 Changed buzzer to KPE116 as better match in frequency response (ie. louder)
for new frequencies.
07/08/04 Dropped in pressure sensor for pitot tube and worked first time! Check
accuracy in howling gale on top of Mam Tor and also spot on. Few twiddles
to software and a new case and will be sorted.
09/08/04 Fix cursor bug on barograph screen; +/- when nothing selected now doesn't
do anything.
Add QNE to main display selection so now QFE/QNH/QNE.
Zero air speed reading if adc is just 1; never reading 0 so previously
always showing 4mph.
If going up, zero glide distance rather than maxing it out
23/11/04 Added missing diode to piezo circuit and corrected duty cycle in
software.
25/11/04 Biased diode adder in piezo circuit with 47k pull down and now finally works
properly! Full doublt Vbat swing across the piezo, returning to 0V at rest.
Will take out for a fly this weekend to test in the air, already sounds
better with 50% duty and a relatively flat (6.5V) battery.
28/11/04 Forgot to add a necessary extra diode into schematics to account for
minimum voltage C27 gets down to (as a consequence of diode drops in
rectification). Now done, also renamed diodes. Will update website description
when next get chance.
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